When appropriate: Laws may mandate screening of young people for lead poisoning. Testing for mercury happens when there's an exposure. There is a great deal of lead in the environment. However, the "pop" / "scare" stuff on the internet is designed to frighten people over mercury poisoning instead, which (as the real thing) is very uncommon. Talk with your physician if you or Junior has been exposed.
Answered 6/28/2015
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